稍微的整理一下，触摸屏的中断也就两种信号，INC_ADC和INC_TC，处理好这两个信号的发生关系，就能很轻易的对触摸进行操作。
1.其中的一种是2440test中自带的Touchpanel.c，但是其中的很多代码可以省略，修改后如下：
void __irq AdcTsAuto(void){ rADCTSC=0x0C; //设置ADCTSC进入自动(连续)x/y轴坐标转换模式
rADCCON|=0x1; //启动AD转换
while(rADCCON & 0x1); //检测AD转换开始有效位是否是低电平，当真正开始转换时，位[0]会自动清0，加上有助于去抖
while(!(rADCCON & 0x8000)); //check if EC(End of Conversion) flag is high, This line is necessary~!!，检测是否转换完，加上有助于去抖 while(!(rSUBSRCPND & (BIT_SUB_ADC))); //检测转换完后产生的AD中断信号，仅用这一个while作为判断ADC转换结束结束中断很不好，去抖不好xdata=(rADCDAT0&0x3ff); //获取x,y的坐标
ydata=(rADCDAT1&0x3ff);//YH 0627, To check Stylus Up Interrupt.
rSUBSRCPND|=BIT_SUB_TC; //对中断未决寄存器相应的ADC、TC(按下)中断位清0，避免多次中断 rSUBSRCPND|=BIT_SUB_ADC; rSRCPND|=BIT_ADC; rINTPND|=BIT_ADC; rADCTSC =0xd3; //Waiting for interrupt rADCTSC=rADCTSC|(1<<8); // Detect stylus up interrupt signal.while(1) //to check Pen-up state
{ if(rSUBSRCPND & (BIT_SUB_TC)) //如果Pen-up中断产生 { Uart_Printf("Stylus Up Interrupt~!\n"); break; //if Stylus is up(1) state } } Uart_Printf("count=d XP=d, YP=d\n", count++, xdata, ydata); //X-position Conversion datarADCTSC=rADCTSC&~(1<<8); // Detect stylus Down interrupt signal.
rSUBSRCPND|=BIT_SUB_TC; //清除TC(Pen-up)中断未决位 rSRCPND|=BIT_ADC; rINTPND|=BIT_ADC;}void Test_Touchpanel(void){ //普通转换模式延迟(1/3.6864M)*50000=13.56ms，x,y转换延迟(1/50M)*50000=1ms rADCDLY=50000; //设置A/D转换预分频使能，分频值为19 rADCCON=(1<<14)+(19<<6); Uart_Printf("ADC touch screen test\n");
rADCTSC=0xd3; //等待模式设置,XP_PU,XP_Dis,XM_Dis,YP_Dis,YM_En
pISR_ADC = (int)AdcTsAuto; //设置中断处理函数函数入口，中断向量注册
rINTMSK &= ~BIT_ADC; //不屏蔽ADC中断位及子中断位 rINTSUBMSK &= ~(BIT_SUB_TC); rINTSUBMSK &= ~(BIT_SUB_ADC);Uart_Printf("\nType any key to exit!!!\n");
Uart_Printf("\nStylus Down, please...... \n"); Uart_Getch(); //等待键盘输入rINTSUBMSK|=BIT_SUB_TC; //屏蔽使能ADC中断位及子中断位
rINTSUBMSK|=BIT_SUB_ADC; rINTMSK|=BIT_ADC; Uart_Printf("Touch Screen Test is Finished!!!\n");} 这个代码时间处理INC_ADC和INC_TC的两个信号放在一个中断函数中进行处理，注意一定要在处理完后对相应的未决寄存器清零。
2.另一种是基于两种信号分别处理的信号，贴码如下：
void ADC_Handle(void){ xdata=(rADCDAT0&0x3FF); //获取x的坐标 ydata=(rADCDAT1&0x3FF); //获取y的坐标 Uart_Printf("count=d XP=d, YP=d\n", count++, xdata, ydata); //在超级终端显示触屏次数以及x,y的坐标 rADCTSC=0xD3; //转换完后进入等待中断模式，等待触摸屏被松开的中断 rADCTSC|=(1<<8); //设置此时检测触点松开中断信号，Detect Stylus Up Interrupt Signal rSUBSRCPND|=BIT_SUB_ADC; //对中断未决寄存器相应的ADC中断位清0，避免多次中断 rSRCPND|=BIT_ADC; rINTPND|=BIT_ADC;}
void TC_Handle(void){ if(rADCDAT0&0x8000) //在等待中断模式时，若触屏被松开，Stylus up { Uart_Printf("\nStylus up\n"); rADCTSC=0xD3; //检测到松开后，继续进入等待中断模式，等待触摸屏被按下 } else //若触摸屏被按下 { Uart_Printf("\nStylus dowm\n"); rADCTSC = 0x0C; //设置ADCTSC进入自动(连续)x/y轴坐标转换模式 rADCCON |=0x01; //启动AD转换 } // while(rADCCON&0x1);// whule(rADCCON&0x8000); rSUBSRCPND|=BIT_SUB_TC; //对中断未决寄存器相应的TC中断位清0，避免多次中断 rSRCPND|=BIT_ADC; rINTPND|=BIT_ADC; }
void __irq AdcTsHandle(void){ if(rSUBSRCPND & BIT_SUB_ADC) //若ADC转换完发生的中断信号，则进入ADC_Handle()函数 ADC_Handle(); if(rSUBSRCPND & BIT_SUB_TC) //若触屏被按下或松开时产生的中断信号，则进入TC_Handle()函数 TC_Handle(); }
void Test_Touchpanel(void){ //普通转换模式延迟(1/3.6864M)*50000=13.56ms，x,y转换延迟(1/50M)*50000=1ms rADCDLY=50000; //设置A/D转换预分频使能，分频值为19 rADCCON=(1<<14)+(19<<6); Uart_Printf("ADC touch screen test\n");
rADCTSC=0xd3; //等待模式设置,XP_PU,XP_Dis,XM_Dis,YP_Dis,YM_En
pISR_ADC = (int)AdcTsHandle; //设置中断处理函数函数入口，中断向量注册
rINTMSK &= ~BIT_ADC; //不屏蔽ADC中断位及子中断位 rINTSUBMSK &= ~(BIT_SUB_TC); rINTSUBMSK &= ~(BIT_SUB_ADC);Uart_Printf("\nType any key to exit!!!\n");
Uart_Printf("\nStylus Down, please...... \n"); Uart_Getch(); //等待键盘输入rINTSUBMSK|=BIT_SUB_TC; //屏蔽使能ADC中断位及子中断位
rINTSUBMSK|=BIT_SUB_ADC; rINTMSK|=BIT_ADC; Uart_Printf("Touch Screen Test is Finished!!!\n");} 总结：分析可得，第二种方案更具可操作性，装订仪即时基于此进行显示
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